Tag Archives: Exchange Server

Exchange Server Oct. 2023 updates fail with error 0x80070534

Posted on 2023-10-14 by guenni

[German]As of October 10, 2023, Microsoft has released security updates for Exchange Server 2016 and Exchange Server 2019. On a number of Exchange Server systems, the installation of the October 2023 updates ends with error 0x80070534. The cause seems to … Continue reading →

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Exchange Server vNext is coming in 2025

Posted on 2022-06-03 by guenni

[German]Tt has been rumored for some time whether there would be a successor to Microsoft Exchange Server 2019, which was released on October 22, 2018. The subscription-based successor announced for 2021 never appeared. Speculation that customers would be forced from … Continue reading →

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How to find weak passwords in Active Directory and eliminate them with PowerShell

[Sponsored Post]Weak or compromised passwords are a known gateway for attackers. If you are able to identify which users in Active Directory (AD) are threatened by this, then PowerShell can help to remedy it. However, PowerShell scripts cannot eliminate basic AD deficits, other tools are needed for this. More ...

Exchange Server November 2021 Security Updates Close RCE Vulnerability CVE-2021-42321

Posted on 2021-11-10 by guenni

[German]For administrators of Exchange Server 2013, 2016 and 2019, Microsoft has released the security updates for the current month as of November 9, 2021. Most relevantly, a Remote Code Execution (RCE) vulnerability CVE-2021-42321 is closed (was exploited at the Tianfu … Continue reading →

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Attacks on Exchange Server via ProxyShell vulnerability (8/13/2021)

Posted on 2021-08-13 by guenni

[German]I'm bringing this up again before the weekend, even though the readership of this blog is probably well informed and keeps the Exchange servers up to date with the latest patches. It's Friday the 13th and we're about to hit … Continue reading →

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Microsoft Defender automatically mitigates CVE-2021-26855 on Exchange Server

Posted on 2021-03-19 by guenni

[German]Microsoft is taking the next step in securing on-premises Exchange installations. Microsoft Defender not only detects infections of a system as a result of the ProxyLogon vulnerabilities. The virus scanner can also automatically detect a vulnerable system and closes the … Continue reading →

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Exchange Server: Terrible Patch Status; v2010 reaches EOL

Posted on 2020-09-30 by guenni

[German]It's a terrible image, that security firm Rapid 7 draws in it's newest report. Round about 247.000 Exchange Servers are running unpatched and are reachable from the Internet. A lot of Exchange Servers are vulnerable against CVE-2020-0688 and thousands of … Continue reading →

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New Office and new Exchange Server in 2021

Posted on 2020-09-23 by guenni

[German]During Ignite 2020, which has just been launched as a virtual conference, Microsoft has announced a new Office for Windows and Mac for 2021, as well as giving initial indications of a new Exchange Server. Advertising

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Exchange Server: Remote Code Execution Vulnerability CVE-2020-16875

Posted on 2020-09-16 by guenni

[German]Administrators of Microsoft Echange Server should take care of patching the remote code execution vulnerability CVE-2020-16875. The details or exploits have now been published. But patches has been available since September 8, 2020. Advertising

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June 2020 Exchange Server quarterly update available

Posted on 2020-06-18 by guenni

[German]On June 16, 2020, Microsoft released the quarterly update June 2020 for Exchange Server 2016 and Exchange Server 2019. This is a cumulative update that includes bugs reported by customers and the security updates that have been applied so far. … Continue reading →

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Exchange Server 2013: Issue with Security Update KB4536988

Posted on 2020-03-02 by guenni

[German]When you install security update KB4536988 (Feb. 2020) to close the vulnerability CVE-2020-0688, Exchange Server 2013 may experience an issue that was described a year ago in Exchange Server 2016. Advertising

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